Dissertations / Theses on the topic 'Particules (physique)'
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Brax, Philippe. "L'intermittence en physique des particules." Paris 6, 1992. http://www.theses.fr/1992PA066070.
Full textMasmoudi, Karim. "Etude des interactions hydrodynamiques particule-particules, particules-parois par interferometrie laser." Rouen, 1998. http://www.theses.fr/1998ROUES041.
Full textVirey, J. M. "Recherche de signaux de nouvelle physique en physique des particules et en cosmologie." Habilitation à diriger des recherches, Université de Provence - Aix-Marseille I, 2007. http://tel.archives-ouvertes.fr/tel-00192853.
Full textEtude de l'énergie noire et de l'extraction des paramètres cosmologiques à partir de différentes sondes cosmiques.
Fayolle, Sébastien. "Thermodiffusion de particules chargées." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13417.
Full textBorel, Hervé. "Comparaison des résultats des expériences de recherche d'oscillations neutrino de Goesgen et du Bugey." Chambéry, 1987. http://www.theses.fr/1987CHAMSOO2.
Full textQian, Zuxuan. "Architecture distribuée pour un logiciel d'analyse interactive en physique des particules." Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX22078.
Full textVilain, Pierre. "Les Courants neutres et les particules charmée en physique du neutrino." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210933.
Full textDehandschoewercker, Eline. "Physique du surf, ou sur l'entraînement de particules par des ondes." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066690/document.
Full textSurfing is a sport in which the athlet must execute figures while standing in balance on a board, carried itself by a water wave. In this PhD study, we investigate the physical phenomena underlying such a transport of a particle by a wave. We specifically focused our attention on two crucial issues when surfing: the catch of the surfer by the wave and its stability on the board. We first establised under which conditions the surfer is carried by the wave in a quantitative manner, for different kinds of waves. We showed that the slope of the wave and the stream within played a significant role for the wave to be able to catch the surfer when breaking. The surfing condition that we found relates the initial relative velocity between the surfer and the incoming wave, which essentially depends on its slope. We then demonstrated that choosing the right board improves the stability of the surfer. This stability condition sets a maximum height of the center of gravity of the surfer from the board, as a function of the board dimensions. We hence highlighted how they influence the minimal surfer velocity above which the surfer balance becomes more stable. The initial velocity of the surfer after paddling is essential to ensure the surfer to catch the wave and improve his stability. We finally study the phenomenon in two other fields of physics: in mechanics and magnetism. The different experiments as well as their common theoretical modeling led to a global and fundamental understanding of the phenomenon
Jalade, Patrice Demeyer Albert. "Mesures et modélisation des effets radiobiologiques des ions légers sur des cellules tumorales humaines application à l'hadronthérapie /." Villeurbanne : Université Claude Bernard, 2005. http://tel.archives-ouvertes.fr/docs/00/06/40/23/PDF/these.pdf.
Full textEtlicher, Bernard. "Étude numérique et expérimentale des générateurs de faisceaux intenses de particules chargées." Paris 11, 1987. http://www.theses.fr/1987PA112175.
Full textGiangiobbe, Vincent. "Etude en faisceau-test de la réponse des calorimètres de l'expérience ATLAS du LHC à des pions chargés d'énergie comprise entre 3 et 350 GEV." Clermont-Ferrand 2, 2006. https://theses.hal.science/docs/00/12/93/05/PDF/Giangiobbe.pdf.
Full textMéhats, Florian. "Étude de problème aux limites en physique d'un transport des particules chargées." Palaiseau, Ecole polytechnique, 1997. http://www.theses.fr/1997EPXX0044.
Full textLiu, Fuming. "La production des particules dans le modèle Nexus." Nantes, 2002. http://www.theses.fr/2002NANT2033.
Full textTo study the formation of a quark gluon plasma, it is of crucial importance to understand in detail the collision dynamics. Parton based Gribov-Regge Theory, realized in the Monte Carlo code neXus, provides a consistent approach for hadron-hadron scattering and the initial stage of nucleus-nucleus collisions at ultra-relativistic energies
Ghisalberti, Claude. "Analyse de corrélation de particules légères sélectionnées par calorimétrie neutronique dans la réaction 208Pb + 93Nb à 29 MeV/u." Nantes, 1994. http://www.theses.fr/1994NANT2119.
Full textMachefert, Frederic. "Mesure de la masse du boson W par la méthode de reconstruction directe dans l'expérience aleph au LEP." Palaiseau, Ecole polytechnique, 1998. http://www.theses.fr/1998EPXX0022.
Full textChon-Sen, Nathalie Dracos Marcos. "Caractéristiques et suivi du trajectographe électronique de la cible d'OPERA : étude des événements électroniques." Strasbourg : Université de Strasbourg, 2009. http://eprints-scd-ulp.u-strasbg.fr:8080/secure/00001109/01/CHON-SEN_Nathalie_2009.pdf.
Full textMongruel, Anne. "Etude expérimentale de suspensions de particules anisotropes en écoulement élongationnel." Marne-la-vallée, ENPC, 1994. http://www.theses.fr/1994ENPC9409.
Full textTafat, Sofiane. "Renormalons infrarouges et corrections de puissance en chromodynamique quantique." Paris 11, 2001. http://www.theses.fr/2001PA112328.
Full textThis thesis in theoretical elementary particle physics and specially in quantum chromodynamics. During my thesis I have been working on the problem of quantifying nonperturbative corrections to various QCD observables assiociated with the hadronization phenomenon. The hadronization corrections come from the interface of perturbative and perturbative and nonperturbative QCD dynamics and their study sheds some light into the confinement mechanism. One of the existing approaches to describe these corrections relies on the analysis of ambiguities of perturbative series to the QCD observables the so called infrared renormalons. This approach has many interesting phemenological applications and it hes been tested experimentally against aavaible data on the measurements of deviations of perturbative QCD predictions to various observables at LEP, Tevatron and DESY. The infrared renormalon approach has a number of limitations. Firstly, it does not tell us much about the origin of nonperturbative scale and underlying QCD dynamics. .
Haas, Benjamin. "QCD sur réseau et physique du charme." Paris 11, 2009. http://www.theses.fr/2009PA112359.
Full textLn this thesis, we present the results of the study of the charm properties on the lattice. We used unquenched configuration with Wilson-like actions, i. E. Wilson--Clover and twisted-mass quark actions. We studied the decay of the $$D"\ast$$ meson and computed the coupling hadronic coupling $$g_{D"\ast D\pi}$$,the radiative coupling $$g_{D"\ast D\gamma}$$. We then studied the leptonic and semileptonic of the $$D_{(s)}$$-mesons. We constrained the CKM matrix entries $$\vert V_{cd} \vert$$ and $$\vert V_{cs} \vert$$
Mei, Pu. "Corrélations spatiales des particules dans l’Hélium-6 et dans l’Hélium-8." Caen, 2011. http://www.theses.fr/2011CAEN2066.
Full textIn a nuclear system, each nucleon is subject to nuclear forces exerted by the others, and the structure of states provides evidence of the nature of the interactions. On the other hand, the nuclear wave function is a measure of the probability of a particular geometry. As such, it provides an illustrative picture of the geometric structures inside the nucleus. Knowledge of the geometries of nuclear matter in specific quantum states helps understand nuclear structure and interactions, provides theoretical validation and allows prediction of experimental results. This thesis has its focus on the geometries of two and four identical particle systems, in particular those resulting from the short-range attractive nature of nuclear interactions. For two-particle systems coupled to an arbitrary angular momentum, distinct spatial and angular configurations are found regularly related to the quantum numbers, which is explained analytically. Application to the Borromean halo nucleus 6He with first the delta interaction and then the pairing interaction shows the coexistence of the di-neutron and the cigar-like configurations, with a predominance of the former over the latter. As for four-particle systems, 8He is studied as a prototype. The expression of the angular probability density is derived analytically for a general 0+ state. Configurations in terms of relative angles where the angular probability density peaks fall into two categories of geometries with specific symmetries, which can be considered as the generalization of the geometries of a two-particle system to those of a four-particle system
Jalade, Patrice. "Mesures et modélisation des effets radiobiologiques des ions légers sur des cellules tumorales humaines : application à l'hadronthérapie." Lyon 1, 2005. http://tel.archives-ouvertes.fr/docs/00/06/40/23/PDF/these.pdf.
Full textSilverman, Lynn. "Les approximations successives en ethnographie, en anthropologie visuelle et en physique des particules." Paris 10, 1988. http://www.theses.fr/1988PA100050.
Full textThe thesis begins with a personal account of the early influences on the author, in which one finds the seeds of this filmed ethnographic study of a "tribe" of high energy physicists. The thesis documents the filmmaker anthropologist author's method of working from both a theoretical and practical point of view. The author makes an analogy between the role of the particle physicist in our society and that of the blacksmith in West Africa. One point of comparison is that each is the "keeper of knowledge" for his society. The physicist is keeper of a knowledge which is very difficult for the non-initiated, such as the author, to understand. As a curious outsider who is not scientifically inclined, the author feels that the best method with which to try to understand this complicated and difficult society is one of successive approximations. A significant section of the thesis is given to an explanation of this method of learning. From a more practical point of view, the author describes in detail the process of shooting and editing the film "invisible energy". The film which accompanies the written thesis. "Invisible energy documents the confusion inherent in scientific discovery. In the written thesis, the author underlines the fact that physicists, who are working at the very limits of our technological and scientific knowledge, are usually working in a situation of risk. There is no guarantee that a new technology will work as planned, or that an extremely expensive piee of equipment will lead to important new discoveries. In addition, the author describes, CERN, the European laboratory for particle physics, where the film takes place, and discusses some of the important issues facing cern. Today. It is worth noting that cern is a fascinating area for study not
Dekeyser, Jean-Luc. "Architectures et algorithmes parallèles pour les méthodes Monte-Carlo en physique des particules." Lille 1, 1986. http://www.theses.fr/1986LIL10075.
Full textDekeyser, Jean-Luc. "Architectures et algorithmes parallèles pour les méthodes Monte Carlo en physique des particules." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375970222.
Full textAzhari, Ahmed. "L'ansatz de Jastrow et ses généralisations pour n-particules quantiques bidimensionnelles." Tours, 1997. http://www.theses.fr/1997TOUR4018.
Full textLi, Chuan. "La source solaire des particules énergétiques interplanétaires." Paris 11, 2008. http://www.theses.fr/2008PA112342.
Full textTomchuk, Bogdan. "Diffusion des particules transversalement au champ magnétique et diffusion exacerbée des ondes électromagnétiques." Palaiseau, Ecole polytechnique, 2000. http://www.theses.fr/2000EPXX0006.
Full textAlmer, Julie Champagne Jean-Yves Bigillon Françoise. "Etude expérimentale du rôle de la turbulence de paroi dans le transport de particules." Villeurbanne : Doc'INSA, 2008. http://docinsa.insa-lyon.fr/these/pont.php?id=le_louvetel-pouilly.
Full textDucasse, Lauris. "Mouvements collectifs de particules en turbulence : collisions et concentration préférentielle." Nice, 2009. http://www.theses.fr/2009NICE4115.
Full textThis thesis encompasses numerical studies of problems concerning the dynamics of particles in turbulent flows. Turbulence has been modelised using a random Fourier modes method known as kinematic simulations allowing us to change the parameters of the problem for a low numerical cost. The main part of the dissertation analyses the properties of the collision rate of inertial particles in dilute systems compatible which meteorogical situations. The collision rate is estimated using a Lagrangian method recently proposed by Falkovich and Pumir (2007) and systematically compared which direct numerical measurements. The contribution of the sling effect, originally introduced by Falkovich et al. (2002), to the collision rate has been quantified following this approach. The results show that this latter is negligible in the limit of very small Stokes numbers (adimensionned relaxation time of the particles), so that the enhancement of the collision rate with respect to the case of tracers can only be explained by preferential concentration. On the other hand, the sling contribution increases sharply when the Stokes number exceeds a threshold around St = 0. 3 and can become dominant if the gravity is not too strong. A second part concerns the properties of the distributions of tracers on compressible surface flows. The second moment of these distributions has been computed explicitly in both inertial and dissipative range allowing us to quantify the fluctuations of the coarse grained concentration field (preferential concentration) with respect to the scale. The results let appear some similitudes with the case of inertial particles in incompressible flows
Vincent-Donnet, Caroline. "Analyse des collisions périphériques mesurées par multidétection 4π (AMPHORA) lors de la réaction nucléaire 22Ne + 93 Nb à 35 MeV-nucléon." Lyon 1, 1993. http://www.theses.fr/1993LYO10090.
Full textCothenet, Alexis. "Recherche de leptoquarks scalaires de première génération auprès de DØ." Aix-Marseille 2, 2004. http://www.theses.fr/2004AIX22052.
Full textChang, Emmanuel. "QCD sur réseaux et les propriétés des mésons lourd-légers : les distributions radiales dans les mésons lourd-légers et le mélange Bº-B̄º dans la limite statique." Paris 7, 2009. http://www.theses.fr/2009PA077204.
Full textPhenomenology of the heavy-light mesons is investigated by using QCD simulations on the lattice. The work is particularly focused on the light quark dynamics in the heavy-light Systems when the heavy quark is infinitely heavy. The mass splitting between the excited and the lowest lying states has been studied with the unquenched lattice data containing SN__f=2S dynamical light quarks. A very high accuracy of the lattice results for the coupling to the pions is achieved through several improvements over previous lattice computations of these couplings. Moreover, the present study provides a new method which allows for the first lattice determination of the pion emission in the transition between the first excited and the lowest lying heavy-light meson. These couplings are necessary ingredients for the description of heavy-light mesons by an effective theory known as the Heavy Meson Chiral Perturbation Theory. They are also essential in the chiral extrapolations of the lattice results for the quantities which are relevant to the SBS-physics phenomenology. Special attention is devoted to the improvement of the technique of Computing the static heavy quark propagator on the lattice by using the hyper-cubic blocking techniques (HYP). We then make a detailed study of the matrix elements of ail parity conserving four-quark S\Delta B=2S operators which enter the theoretical description of the SB~0S-S\bar B~0S mixing amplitude in the Standard Model, and in its supersymmetric extensions. This is the first such study with HYP-blocked Wilson lines, which provides us with an extra benefit: the spurious mixing of operators computed on the lattice is much smaller with respect to what has been done in the past. Renormalization and matching of Heavy Quark Effective Theory on the lattice to the continuum QCD is made by using boosted perturbation theory. A short discussion of impact of our results on the SBS-physics phenomenology is provided too
Lam, Minh-Phuong Ababou Rachid. "Modélisation 3D du transport particulaire asynchrone en simple et double continuum matrice-fractures application au stockage de déchets nucléaires /." Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000684.
Full textQuilain, Benjamin. "Measurement of the muon neutrino cross section through charged-current interactions and search for Lorentz invariance violation at the T2K experiment : neutrino oscillation." Palaiseau, Ecole polytechnique, 2014. http://www.theses.fr/2014EPXX0071.
Full textTram, Vi-Nham. "Etude de la production du J/v dans les collisions or-or à 200GeV par paire de nucléons dans l'expérience PHENIX." Palaiseau, Ecole polytechnique, 2006. https://pastel.archives-ouvertes.fr/pastel-00001917.
Full textForot, Michael. "Accélération de particules au sein des vents relativistes de pulsar : simulation et contraintes observationelles avec le satellite INTEGRAL." Paris 7, 2006. http://www.theses.fr/2006PA077049.
Full textThe context of this thesis is to gain new constraints on the different particle accelerators that occur in the complex environment of neutron stars: in the pulsar magnetosphere, in the striped wind or wave zone outside the light cylinder, in the jets and equatorial wind, and at the wind terminal shock. Near the star, the accelerator is powered by the rotation of the intense magnetic field and can be probed by the pulsed radiation at all wavelengths. An additional powerful tool to investigate the magnetic geometry in the radiative zones, therefore the accelerator location, is polarimetry, especially at high photon energy. The shocked wind of the Crab nebula and a handful of other wind nebulae are known to host 1014-15 eV particles, but thé energy estimates are always subject to the uncertain evaluation of the local magnetic field strength. The famous spherical model of Kennel and Coroniti (1984) has been challenged by high-resolution X-ray and TeV images that show a growing wealth of jets and equatorial flows, confined by asymmetric pressure gradients in a supernova remnant or by interstellar bow shocks. An important tool to constrain both the magnetic field and primary particle energies is to image the synchrotron ageing of the population, but it requires a careful modelling of the magnetic field evolution in the wind flow. The current models and understanding of these different accelerators, the acceleration processes, and open questions have been reviewed in the first part of the thesis. In this context, the thesis work is three-fold: instrumental, observational, and theoretical. On board INTEGRAL, the IBIS imager provides images with 12' resolution from 17 keV to MeV energies where the SPI spectrometer takes over up, to 10 MeV, but with a reduced 2° resolution. The first part of the work provides a new method for using the double-layer IBIS imager as a Compton telescope with coded mask aperture. Its performance has been measured. The new concept takes advantage of the coded mask deconvolution for high resolution and background rejection to construct images with a 12' resolution, over a 29°x29° field of view, at the 0. 1-0. 4 Crab sensitivity level, in the 0. 2-1 MeV range. The Compton scattering information and the achieved sensitivity also open a new window for polarimetry in gamma rays. A method has been developed to extract the linear polarization properties and to check the instrument response for fake polarimetric signais in the various backgrounds and projection effects. The achieved sensitivity of 0. 3-1 Crab for polarized emission allows the study of bright sources and AGN flares, gamma-ray bursts and solar flares for the first time at high energy. The INTEGRAL data recorded for the Crab pulsar and nebula show good evidence for a high degree of polarization for both the pulsed and the unpulsed emissions in the 0. 2-0. 8 MeV band. The measured polarization closely follows the optical one from the central < 0. 01 pc region around the pulsar. The polarization orientation along the rotation axis is consistent with emission from the jet and bright knot, not with DC emission from the pulsar beams. No polarization has been detected on the trailing sides of the pulsed peaks. It could sign the caustic effects that characterize emission along a fair fraction of the last open field lines on the trailing sides of the pulsar magnetosphere. A dipolar magnetic field geometry is assumed in the magnetosphere and a split-monopole one outside, but they can be questioned for very intense stellar fields or very compact magnetospheres. As a first step to map this field in general relativity, Einstein and Maxwell equations have been solved near the pulsar, in vacuum, using the LORENE library to find the rotating star metric together with the associated magnetic and electric fields. This library is based on spectral methods well adapted for Poisson type equations. The resulting field geometry differs slightly from a dipole and the acceleration regions are closed to the polar caps. Studying the geometry in a charged magnetosphere with potential currents will be the next step. INTEGRAL synchrotron data above 30 keV is best suited to probe the most energetic wind particles and their ageing in the flow by comparison with lower-energy images. The wind from PSR B1509-58 powers a long X-ray jet and TeV tail. The unpulsed emission recorded by INTEGRAL-IBIS at 20-200 keV has been used to detect a slightly extended source along the jet axis, with a power-law spectrum up to 160 keV. The variation of the apparent jet length with energy from 0. 1 to 100 keV has been interpreted as synchrotron ageing in a simple cylindrical jet. This allows to constrain both the average jet magnetic field to 2 or 3 nT and the electron energies near the cut-off to 400-700 TeV. Many older wind nebulae are confined into a bow shock geometry by the ram pressure of their motion into the interstellar medium. This morphology modifies the MHD flow by providing an exit for the kinetic and magnetic energy and stationary conditions. Very hard synchrotron X-ray tails have been imaged around the nearby, 0. 3 Myr-old, Geminga pulsar. A first attempt at modelling the emission shows that Fermi acceleration at the wind terminal shock or at the bow shock cannot produce the required particle energies. As for the Crab, the particles must somehow tap the potential drop from the pulsar unipolar inductor. We also find that the particles are too few and/or the magnetic field to low to account for the observed X rays. The prediction falls short by 2 or 3 orders of magnitude. A simple analytical MHD model has been developed to show that the magnetic field advection toward the bow-shock contact discontinuity and the resulting amplification can explain the observed flux. Electron energies of 400 TeV are found. This 'toy model1 proves the importance of a careful modelling of the magnetic flow to interpret the data
Saldo, Valérie. "Etude du dépôt d'aérosols dans des conduites en écoulement fortement turbulent." Aix-Marseille 1, 1996. http://www.theses.fr/1996AIX11060.
Full textKerouanton, David. "Etude de la composante ultrafine issue du radon-222 à partir d'un canal de diffusion annulaire muni d'un détecteur de traces nucléaires." Brest, 1996. http://www.theses.fr/1996BRES2032.
Full textMunier, Stéphane. "Contributions a l'etude de la chromodynamique quantique perturbative appliquee a la diffusion profondement inelastique a petit x b j." Palaiseau, Ecole polytechnique, 2000. http://www.theses.fr/2000EPXX0033.
Full textD'Agostini, Gilles. "Etude des propriétés et des effets du gluon dans la diffusion très inélastique d'un muon sur un nucléon." Aix-Marseille 2, 1986. http://www.theses.fr/1986AIX22050.
Full textMAHBOUB, DJELLOUL. "Étude des corrélations angulaires de particules légères chargées dans la réaction #3#5CL (260 MEV) #+ #2#4MG." Université Louis Pasteur (Strasbourg) (1971-2008), 1996. http://www.theses.fr/1996STR13220.
Full textEspitalier-Noël, Grégory. "Phénoménologie des extensions supersymétriques non-minimales du Modèle Standard de la physique des particules." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20221/document.
Full textThe discovery of a particle similar to the Higgs boson predicted by the Standard Model (SM) of particle physics has been confirmed by the experiments CMS and ATLAS of the Large Hadron Collider at the CERN. However, it is not yet clear that the properties of this particle are those predicted by the SM. This, in addition with several other observations (Dark Matter,...), is a motivation for analysing supersymmetric extensions of the SM, as the NMSSM. We study in this thesis the solution of the Hierarchy problem in the NMSSM, linked with the quadratic divergences in the Higgs sector, and also the phenomenology of the NMSSM with gauge mediation supersymmetry breaking in the light of the latest data from the LHC. Finally, we present the developments made in the codes of the package NMSSMTools, featuring Monte Carlo Markov Chain methods, Fine Tuning calculus, the calculus of supersymmetric particle's cascade decays and the implementation of the general NMSSM
Mathieu, Olivier. "Application des méthodes de l'intelligence artificielle à l'analyse de données en physique des particules." Aix-Marseille 2, 1990. http://www.theses.fr/1990AIX22058.
Full textBenchekroun, Driss. "Caractérisation de l'émission de fragments par corrélations azimutales avec le détecteur 4π AMPHORA : étude des systèmes 32S + 58Ni et natAg à 38 MeV par nucléon." Lyon 1, 1994. http://www.theses.fr/1994LYO10094.
Full textStaar, Adrien. "La production de particules aux énergies du collisionneur du CERN." Paris 6, 1986. http://www.theses.fr/1986PA066144.
Full textZimmermann, Marc. "Sedimentation de particules en ecoulement oscillatoire." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13005.
Full textBeghin, Diego. "Search for new high mass resonances or quantum black holes decaying to lepton flavor violating final states with the CMS detector." Doctoral thesis, Universite Libre de Bruxelles, 2020. https://dipot.ulb.ac.be/dspace/bitstream/2013/316057/3/Thesis.pdf.
Full textThis thesis presents a novel search for new physics in lepton flavor violating final states, using the CMS detector. There is first a discussion of the Standard Model of particle physics, with a particular emphasis on the issue of lepton flavor conservation, and how often that conservation is violated when generic modifications of the Standard Model are performed. The questions left unanswered by the Standard Model are presented, as well as some new physics models which resolve them, and in so doing imply the existence of processes violating charged lepton flavor conservation. R-parity violating supersymmetry, models with large extra dimensions,and models with an extra U(1) gauge symmetry are discussed. The Large Hadron Collider, the CMS detector, its trigger system and event reconstruction software are all described in detail. The data used for the analysis corresponds to an integrated luminosity of 137 /fb collected by CMS during three years of LHC Run 2 (2016-18), at a center-of-mass energy √s = 13 TeV. The background estimation strategy is to use simulations for all processes with real leptons, while large-yield processes with misidentified leptons are estimated with data-driven methods. The simulations are corrected by scale factors accounting for experimental calibration and more precise theoretical calculations. After comparing the observed data and the expected background, no evidence of new physics is found, and a statistical analysis is performed to exclude new physics models at the 95 % confidence level. For the benchmark lepton flavor violating Z’ model, the lower limit in the eμ (respectively eτ ,μτ ) final state on the resonance mass is 5.0 TeV (resp. 4.2 TeV, 4.1 TeV). Such an analysis had never been performed in the tau channels with the CMS detector, and in all channels these results considerably improve on the previous state-of-the-art results.
Doctorat en Sciences
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Ndayizeye, David. "Validation de la réponse du détecteur de neutrons WENDI-2 dans un faisceau de neutrons quasi-monoénergétiques pour son utilisation dans un centre de protonthérapie." Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/279189/4/thesis.pdf.
Full textDoctorat en Sciences
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Charignon, François. "Etude de la production du (lambda)c+ et recherche du Pentaquark dans les données de l'expérience WA89 du CERN." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10001.
Full textAutricque, Adrien. "Dust transport in tokamaks." Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0315.
Full textThermonuclear fusion could play an important role amongst the numerous alternative energy sources, especially though the tokamak configuration. It could be a prime candidate for the energy transition, owing to its significant advantages (fuel abundance, low amount of wastes generated, low risks of accidents). However, a certain amount of technological and physical challenges require solving before any fusion power plant can be built. Dust production is one of the major difficulties encountered in tokamaks. These small particles, made out of wall material, are created by erosion of the plasma-facing components by the plasma, where the fusion reactions occur. Dust particles can be transported in the plasma, thereby unleashing large amounts of impurities, which in turn reduces the plasma performances (by raising radiative losses and generating instabilities) and can even jeopardize plasma-facing components. Aiming to understand dust transport, injection experiments are performed on the Korean tokamak \KSTAR. Trajectories are recorded on film via fast cameras and are extracted by image processing routines. A numerical tool implementing the latest models for dust-plasma interactions is developed, and comparisons with experimental data is made, confirming the overall tendency of these models to underestimate the trajectory lengths. Leads of improvements are presented. Concerning dust sources and sinks, the focus is made on dust adhesion and resuspension of dust on the machine walls